Pneumatic water-hammer-resistant pressure balance stop valve

Abstract

The utility model discloses a pneumatic water hammer resistant pressure balance stop valve which comprises an air cylinder, a spring, a piston rod and a valve core body, the piston rod is installed in the air cylinder through the spring, a support is installed below the air cylinder through a screw, an upper valve body is installed below the support, a valve cover is installed on the top of the upper valve body, and a valve rod is installed on the valve cover. A lower valve body is installed below the upper valve body, a gland is installed at the bottom of the lower valve body through a hoop, a fixing ring is arranged between the lower valve body and the upper valve body, the valve element body is arranged in the upper valve body and the lower valve body, and a valve element seal is arranged on the surface of the valve element body. The utility model is not influenced by a water hammer, has good sealing performance and does not leak.

Description

Technical Field

[0001] The utility model relates to the technical field of sanitary valves, in particular to a pneumatic water hammer resistant pressure balanced stop valve. Background Art

[0002] The stop valve is a common pipeline valve. Its main function is to control or cut off the flow of fluid. It is often used in branches or ends of pipeline systems to control or cut off the transmission of fluid in the pipeline system. It plays an important role in various pipeline systems and is mainly used in food, beverage, dairy, beer, petroleum, chemical, pharmaceutical, electricity and other pipelines.

[0003] The existing stop valve is mainly composed of a valve body, a valve core, a valve cover, a bracket and a cylinder. The valve body is provided with an inlet and an outlet for the fluid medium, which are respectively connected to the pipeline system. The fluid medium flows in from the inlet of the valve body and flows out from the outlet. The existing stop valve is of low-inlet and high-outlet type, that is, the fluid medium flows in from the low inlet. One end of the valve core is connected to the piston rod of the pneumatic drive device, and the other end is in contact with the sealing surface of the valve body for sealing. When the pneumatic stop valve is in a closed state, the valve core is pressed on the sealing surface of the valve body by the preload force of the spring in the cylinder to seal, and the fluid medium is cut off and does not flow. When the pressure of the fluid medium rises greatly instantly, such as when a water hammer comes, the valve core is pushed open due to the excessive fluid medium, resulting in the inability to seal the valve core and the valve body, so that the stop valve does not completely cut off the fluid medium at the pipeline inlet, thereby causing leakage problems. Therefore, we propose a pneumatic anti-water hammer pressure balanced stop valve. Utility Model Content

[0004] The utility model aims to provide a pneumatic water hammer resistant pressure balanced stop valve to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pneumatic anti-water hammer pressure balanced stop valve, comprising a cylinder, a spring, a piston rod and a valve core body, the piston rod being installed inside the cylinder through a spring, a bracket being installed below the cylinder through screws, an upper valve body being installed below the bracket, and a valve cover being installed on the top of the upper valve body, a lower valve body being installed below the upper valve body, and a pressure cover being installed on the bottom of the lower valve body through a clamp, a fixing ring being arranged between the lower valve body and the upper valve body, the valve core body being arranged inside the upper valve body and the lower valve body, and a valve core seal being arranged on the surface of the valve core body.

[0006] Preferably, an air source connector is installed on the outer wall of the bottom of the cylinder, and an exhaust plug is provided on the outer wall of the top of the cylinder.

[0007] Preferably, a bushing and a sealing ring are respectively provided inside the valve cover, and the bushing, the sealing ring and the valve core body are tightly fitted.

[0008] Preferably, the bottom end of the piston rod passes through the bracket and is fixedly connected to the valve core body.

[0009] Preferably, an O-ring is provided above the gland, and the O-ring fits tightly with the valve core body.

[0010] Preferably, the top end of the piston rod extends to above the cylinder and is provided with a second screw hole.

[0011] Preferably, a driving frame is installed on the top of the cylinder, and a threaded hole is provided on the top of the driving frame, and a threaded rod is connected to the inner thread of the threaded hole.

[0012] Preferably, a connecting plate is movably connected to the bottom of the threaded rod, and a first screw hole is provided on one side inside the connecting plate, and a bolt is connected to the internal thread of the first screw hole, and the bolt cooperates with the second screw hole.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] When the valve core seal is pushed into the flow hole, the valve core body and the fixed ring flow hole are sealed, the valve is closed, and the upper valve body and the lower valve body are not circulated; when the compressed air is filled into the cylinder, the compressed air pushes the piston rod to move upward, and the piston rod drives the valve core body to lift upward together. At this time, when the valve core seal escapes from the fixed ring flow hole, the upper valve body and the lower valve body are connected, and the valve is in an open state. Further, the valve core body is a balanced I-shaped structure, which is respectively provided with two force-bearing surfaces of equal area. The fluid medium pressure P acts on the inner surface of the I-shaped structure to generate an upward force p1 and a downward force p2. When the force-bearing surfaces are equal, the force p1 is equal to p2, that is, p1 and p2 cancel each other out, and the fluid medium will not generate an upward or downward thrust on the valve core body. Even if the medium pressure is high, the thrust of the valve core body by the medium is zero. Therefore, when the valve is closed, when the fluid medium rises instantly or water hammer comes, the valve core body will not be displaced and will always remain sealed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the valve in the closed state of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the valve in the open state of the utility model;

[0018] Figure 4 It is a partial enlarged structural schematic diagram of the utility model;

[0019] Figure 5 It is a schematic diagram of the enlarged structure of the cylinder of the utility model.

[0020] In the figure: 1. cylinder; 2. spring; 3. piston rod; 4. screw; 5. bracket; 6. valve cover; 7. bushing; 8. sealing ring; 9. upper valve body; 10. valve core body; 11. valve core seal; 12. fixing ring; 13. lower valve body; 14. O-ring; 15. clamp; 16. pressure cover; 17. air source connector; 18. exhaust plug; 19. drive frame; 20. connecting plate; 21. first screw hole; 22. bolt; 23. threaded hole; 24. threaded rod; 25. second screw hole. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. All other embodiments obtained by ordinary technicians in the field without creative work based on the embodiments of the utility model shall fall within the scope of protection of the utility model.

[0023] See also Figure 1-5 The utility model provides an embodiment: a pneumatic anti-water hammer pressure balanced stop valve, comprising a cylinder 1, a spring 2, a piston rod 3 and a valve core body 10, the piston rod 3 is installed inside the cylinder 1 through the spring 2, a bracket 5 is installed below the cylinder 1 through a screw 4, an upper valve body 9 is installed below the bracket 5, and a valve cover 6 is installed on the top of the upper valve body 9, a lower valve body 13 is installed below the upper valve body 9, and a pressure cover 16 is installed at the bottom of the lower valve body 13 through a clamp 15, and a fixing ring 12 is provided between the lower valve body 13 and the upper valve body 9;

[0024] The valve core body 10 is arranged inside the upper valve body 9 and the lower valve body 13, and a valve core seal 11 is arranged on the surface of the valve core body 10;

[0025] Specifically, the pneumatic anti-water hammer pressure balanced stop valve is mainly composed of an upper valve body 9, a lower valve body 13, a valve core body 10, a bracket 5, a valve cover 6, a fixing ring 12, a sealing ring 8, a clamp 15, a pressure cover 16 and a cylinder 1. A spring 2 and a piston rod 3 are arranged in the cylinder 1. The spring 2 is pre-tightened and pressed on the upper part of the piston rod 3. A certain force is transmitted to the valve core body 10 connected thereto through the spring 2. A fixing ring 12 is arranged between the upper valve body 9 and the lower valve body 13. A flow hole is arranged in the middle of the fixing ring 12. When the valve core seal 11 is pushed into the flow hole, the valve core body 10 and the fixing ring 12 flow hole are sealed, the valve is closed, and the upper valve body 9 and the lower valve body 13 are not circulated; when compressed air is filled into the cylinder 1, the compressed air pushes the piston rod 3 to move upward, and the piston rod 3 drives the valve core body 10 to lift upward together. At this time, when the valve core seal 11 escapes from the fixing ring 12 flow hole, the upper valve body 9 is connected with the lower valve body 13, and the valve is in an open state;

[0026] An air source connector 17 is installed on the outer wall of the bottom of the cylinder 1, and an exhaust plug 18 is provided on the outer wall of the top of the cylinder 1;

[0027] The inside of the valve cover 6 is provided with a bushing 7 and a sealing ring 8, and the bushing 7, the sealing ring 8 and the valve core body 10 are tightly fitted;

[0028] The bottom end of the piston rod 3 passes through the bracket 5 and is fixedly connected to the valve core body 10;

[0029] An O-ring 14 is disposed above the gland 16, and the O-ring 14 fits tightly against the valve core body 10;

[0030] Furthermore, the valve core body 10 is a balanced I-shaped structure, which is provided with two force-bearing surfaces of equal area. The fluid medium pressure P acts on the inner surface of the I-shaped structure to generate an upward force p1 and a downward force p2. When the force-bearing surfaces are equal, the force p1 is equal to p2, that is, p1 and p2 cancel each other out. The fluid medium will not generate an upward or downward thrust on the valve core body 10. Even if the medium pressure is high, the thrust of the valve core body 10 by the medium is zero. Therefore, when the valve is closed, when the fluid medium rises instantly or water hammer comes, the valve core body 10 will not be displaced and will always remain sealed.

[0031] In addition, the valve cavity is a split design, consisting of an upper valve body 9 and a lower valve body 13, which are flexibly connected by a clamp 15 and can be rotated 360 degrees to adjust the angle of the inlet and outlet, making it easy to align with the system pipeline. The valve core body 10 in the upper and lower valve cavities has a pressure balancing function, and the inlet and outlet directions of the valve are not fixed, and can be in from the top and out from the bottom, or in from the bottom and out from the top;

[0032] The top end of the piston rod 3 extends to the top of the cylinder 1 and is provided with a second screw hole 25;

[0033] A driving frame 19 is installed at the top of the cylinder 1, and a threaded hole 23 is provided at the top of the driving frame 19, and a threaded rod 24 is connected to the inner thread of the threaded hole 23;

[0034] The bottom of the threaded rod 24 is movably connected to the connecting plate 20, and a first screw hole 21 is provided on one side of the connecting plate 20, and a bolt 22 is threadedly connected to the inside of the first screw hole 21, and the bolt 22 cooperates with the second screw hole 25;

[0035] Specifically, the connecting plate 20 is rotated to the top end of the piston rod 3, and the bolt 22 inside the first screw hole 21 is screwed into the second screw hole 25 to connect the connecting plate 20 to the piston rod 3. Then the threaded rod 24 is rotated to move upward in the threaded hole 23. The threaded rod 24 drives the piston rod 3 upward through the connecting plate 20, and the valve can be opened. This design allows the valve to be manually opened and closed even when the power is off.

[0036] When the embodiment of the present application is in use: first, the pneumatic anti-water hammer pressure balanced stop valve is mainly composed of an upper valve body 9, a lower valve body 13, a valve core body 10, a bracket 5, a valve cover 6, a fixing ring 12, a sealing ring 8, a clamp 15, a pressure cover 16 and a cylinder 1. A spring 2 and a piston rod 3 are arranged in the cylinder 1. The spring 2 is pre-tightened and pressed on the upper part of the piston rod 3. A certain force is transmitted to the valve core body 10 connected thereto through the spring 2. A fixing ring 12 is arranged between the upper valve body 9 and the lower valve body 13. A flow hole is arranged in the middle of the fixing ring 12. When the valve core seal 11 is pushed into the flow hole, the flow hole of the valve core body 10 and the fixing ring 12 are sealed, the valve is closed, and the upper valve body 9 and the lower valve body 13 are not circulated; when compressed air is filled into the cylinder 1, the compressed air pushes the piston rod 3 to move upward, and the piston rod 3 drives the valve core body 10 to lift upward together. At this time, when the valve core seal 11 escapes from the flow hole of the fixing ring 12, the upper valve body 9 is connected with the lower valve body 13, and the valve is in an open state. Furthermore, the valve core body 10 is a balanced I-shaped structure, which is provided with two force-bearing surfaces of equal area. The fluid medium pressure P acts on the inner surface of the I-shaped structure to generate an upward force p1 and a downward force p2. When the force-bearing surfaces are equal, the force p1 is equal to p2, that is, p1 and p2 cancel each other out. The fluid medium will not generate an upward or downward thrust on the valve core body 10. Even if the medium pressure is high, the thrust of the valve core body 10 by the medium is zero. Therefore, when the valve is closed, when the fluid medium rises instantly or water hammer comes, the valve core body 10 will not be displaced and will always remain sealed. Furthermore, the connecting plate 20 is rotated to the top of the piston rod 3, and the bolt 22 in the first screw hole 21 is screwed into the second screw hole 25, so that the connecting plate 20 is connected to the piston rod 3, and then the threaded rod 24 is rotated to move upward in the threaded hole 23. The threaded rod 24 drives the piston rod 3 upward through the connecting plate 20, and the valve can be opened. This design allows the valve to be manually opened and closed when it is in a power-off state. In addition, the valve cavity is a split design, consisting of an upper valve body 9 and a lower valve body 13, which are movably connected by a clamp 15, and can be rotated 360 degrees to adjust the angle of the inlet and outlet, so as to facilitate alignment with the system pipeline. The valve core body 10 in the upper valve cavity and the lower valve cavity has a pressure balancing function, and the inlet and outlet directions of the valve are not fixed, and the valve can be inletted from the top and outletted from the bottom, or inletted from the bottom and outletted from the top.

[0037] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

Claims

1. Pneumatic anti-water hammer pressure balanced stop valve, characterized by: The invention comprises a cylinder (1), a spring (2), a piston rod (3) and a valve core body (10), wherein the piston rod (3) is mounted inside the cylinder (1) via the spring (2), a bracket (5) is mounted below the cylinder (1) via a screw (4), an upper valve body (9) is mounted below the bracket (5), a valve cover (6) is mounted on the top of the upper valve body (9), a lower valve body (13) is mounted below the upper valve body (9), a pressure cover (16) is mounted on the bottom of the lower valve body (13) via a clamp (15), a fixing ring (12) is arranged between the lower valve body (13) and the upper valve body (9), the valve core body (10) is arranged inside the upper valve body (9) and the lower valve body (13), and a valve core seal (11) is arranged on the surface of the valve core body (10).

2. The pneumatic anti-water hammer pressure balanced stop valve according to claim 1 is characterized in that: An air source connector (17) is installed on the outer wall of the bottom of the cylinder (1), and an exhaust plug (18) is provided on the outer wall of the top of the cylinder (1).

3. The pneumatic anti-water hammer pressure balanced stop valve according to claim 1 is characterized in that: A bushing (7) and a sealing ring (8) are respectively arranged inside the valve cover (6), and the bushing (7), the sealing ring (8) and the valve core body (10) are tightly fitted.

4. The pneumatic anti-water hammer pressure balanced stop valve according to claim 1 is characterized in that: The bottom end of the piston rod (3) passes through the bracket (5) and is fixedly connected to the valve core body (10).

5. The pneumatic anti-water hammer pressure balanced stop valve according to claim 1 is characterized in that: An O-ring (14) is arranged above the gland (16), and the O-ring (14) is tightly fitted to the valve core body (10).

6. The pneumatic anti-water hammer pressure balanced stop valve according to claim 1, characterized in that: The top end of the piston rod (3) extends to the top of the cylinder (1) and is provided with a second screw hole (25).

7. The pneumatic anti-water hammer pressure balanced stop valve according to claim 1 is characterized in that: A driving frame (19) is installed at the top of the cylinder (1), a threaded hole (23) is provided at the top of the driving frame (19), and a threaded rod (24) is connected to the inner thread of the threaded hole (23).

8. The pneumatic anti-water hammer pressure balanced stop valve according to claim 7, characterized in that: The bottom of the threaded rod (24) is movably connected to a connecting plate (20), and a first screw hole (21) is provided on one side inside the connecting plate (20), and a bolt (22) is threadedly connected inside the first screw hole (21), and the bolt (22) cooperates with the second screw hole (25).

Images